[ui] Add min-height to breadcrumbs to fix layout loop caused by MiddleTruncate RAF #26127
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Summary & Motivation
Fixes the flickering observed in https://dagsterlabs.slack.com/archives/C03CZRZCZQQ/p1732546935350479. When the sizing is async, the height of the element was briefly reduced to the height of the
•••
, which causes an infinite loop of re-rendering. The "30px" minimum height is the default value that would be set if we were not overriding it here.Also added a storybook so we can easily verify this behavior in the future:
How I Tested These Changes
I added a storybook with the same code as the header and verified the flickering is no longer an issue.